The 10th Amendment to the US Constitution reads: “The powers not delegated to the United States [government] by the Constitution, nor prohibited by it to the States, are reserved to the States respectively, or to the people.”
The 11th Amendment reads: “The Judicial power of the United States shall not be construed to extend to any suit in law or equity, commenced or prosecuted against one of the United States by Citizens of another State, or by Citizens or Subjects of any Foreign State.”
If you combine these two Amendments, you begin to see the considerable powers granted to the states.
Why We the People need to Repeal laws and Amendments from 1913
Source: Power of the states vs. power of the federal government: who cares? « Jon Rappoport’s Blog